Mos Def song?

I really love Mos Def's records where he just sings. Even though it's not the greatest, his voice sounds so soulful to me.

I came across a beat randomly on a blog the other day. The beat samples the same record Mos Def did on a song where he just sings, but I can't remember the name of it. Can anyone help? The beat is below, and samples the exact part that Mos Def sings over on his song.